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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
365 | else |
366 | $depth = -1; // Flat. |
367 |
|
368 | $output .= walk_category_dropdown_tree( $categories, $depth, $r ); |
369 | } |
370 |
|
371 | if ( ! $r['hide_if_empty'] || ! empty($categories) ) |
372 | $output .= "</select>\n"; |
373 |
|
374 | $output = apply_filters( 'wp_dropdown_cats', $output ); |
375 |
|
376 | if ( $echo ) |
377 | echo $output; |
378 |
|
379 | return $output; |
380 | } |
381 |
|
382 | /** |
383 | * Display or retrieve the HTML list of categories. |